A clinical perspective in conjunction with anatomy of orbit

1. ANATOMY OF ORBIT Rajvin Samuel Ponraj

6. Bones of Orbit Frontal Ethmoid Sphenoid Lacrimal Palatine Maxillary Zygomatic

15. Le fort’s fracture Type 2 - Pyramidal Type 3 - Craniofacial dissociation

33. Arterial supply

34. Venous drainage

35. Optic nerve Intra orbital part = 25 mm out of 4 cm Enclosed in three meningeal sheaths At apex surrounded by recti muscles , Central retinal artery and vein pierces optic nerve 1.25 cm behind optic nerve Relations: superiorly ophthalmic artery sup ophthal vein nasociliary nerve inferiorly nerve to medial rectus

36. Oculomotor nerve Divides at anterior part of cavernous sinus before Entering sup orbital fissure Sup division Sup rectus LPS Inf division Medial rectus Inf rectus Inf oblique And motor root relay at ciliary ganglion sphincter pupillae , ciliary muscle

37. Trochlear nerve Runs medially from lateral wall of cavernous sinus Above Levator palpebral sup Then supplies orbital surface of Superior oblique

38. Abducent nerve Running inferior lateral to 3 rd nerve then supplies ocular surface of lateral Rectus